Steam-valve



J. WALLACE AND T. R; LEES.

STEAM VALVE.

APPLICATION FILED DEC. I8, 1917- 1,336,451, Pat nted Apr. 13, 1920.

[7 W 3 SHEETS-SHEET 1.

J. WALLACE AND T. R, LEES.

' STEAM VALVE.

APPLICATION FILED DEC. 18, (917.

1, Patented. Apr. 13, 1929 3 SHEETSSHEET 2.

]. WALLACE AND T. R. LEES.

STEAM VALVE.

APPLICATION FILED DEC. 18, 191.7-

1,336,451. v Patented Apr. 13, 1920.

3 SHEETS-SHEET 3- JOHN WALLACE, OF HELENSBURGH, SCOTLAND, AND THOMASROBINSON LEES, OF

SHIREHAMPTON, ENG-LAND.

STEAM-VALVE.

Specification of Letters Patent.

Patented Apr. 13, 19. 0.

Application filed December 18, 1817'. Serial No. 207.732.

To all who/12. it may concern:

Be it known that we, JOHN lVaLLAce and unis Rosmsox liens, subjects ofthe l 5 or the clnited Kingeom of Great Britain and Ireland, andresiding at Helensburgh, Scotland. and Shirehanipton, England,respectively, have invented a certain new and useful Improvement inSteaml alves. oil' which the following is a specification.

This in ention relates to a valve device more particularly to a valvedevice for con trolling the supply of steam for the operation ofwinches, and has for its primary object to provide a construction whichavoids the drawbacks associated with the throttlin of the steam at heusual steam admission valve employed for controlling the winch. Afurther object is to provide a construction of valve device which willserve two cylinders simultaneously.

The invention is illustrated in the accompanying drawings in whichFigure 1 a 'longitudinal section of the complete valve device; Figs. 2,3. t and 5 transverse sections through one oi the pistons of the valveproper; 6 and 7 are transverse sections through the valve chamber; Fig,8 is a developed view of a spring interposed between the inner membersof the valve chamber; 9 is a longitudinal section and Fig. 10 asectional plan of a steam winch to which is applied a valve deviceaccording to the invention. Fig. 11 is a detail view of the controllever and cooperating parts.

it valve device according to the invention comprises a central rotaryvalve proper comng a pair of balanced pistons l, 2, rod with ports 3. 5adapted in the rotation of the valve to register alternately with ports4 in the valve ciamher. When the ports 3 register with the portscommunication is open between the steam space A and the steam admissionside of the cyliir ders B. l/Vhen the ports 5 register with the ports l,communication is open between the exhaust space C and the exhaust sideof the cylinders B. For the purpose of maintaining steam tightness ofthe valve and freedom from liability of the valve proper sticking in thevalve chamber, the chamber is constituted by radially spaced coaxialmembers or" which each inner memher 7 is of semi-annular form, thespaces between the outer member 8 and the inner members 7 being incommunication with the steam spaces A whereby the inner mem bers 7 areforced inwardly; there being also accommodated in the spaces between theinner members 7 and outer member 5 springs 9 which act to hold the innermembers 7 in position. To talc-3 up -zxprinsion in :i direction endwiseof the valve chamber, there interposed between the two inner members '7a spring 10 tending to separate the adjacent ends of the inner members'7 and to force the remote ends .ro'ainst flanges or seating portions 11at the ends of the chamber.

The valve proper receives rotary movement through miter gears 12 fromthe crank shaft 13. A single control lever to is manually operable toimpart endwise movement to the valve spindle l6 and thereby to thepistons l. whereby to vary the extent of opening of the steam admissionand exhaust ports 3 and 5.

This result is effected by reason of the fact that the said controllever is, in the construction shown in Fig. 11, attached to a shaft 17having fixed arms 18 between which is mounted a block 19 notched toengage a flange on a collar 20 fixed to the valve spindle 16 to which isattached an exten tion 16 having a splinet sliding connec tion with asha'tt 16 rotating with the gear 12: so that by adjusting the controllever 15 to different positions the steam admission and exhaust portswill be opened more or less as may be desired. In the construction shownin Fig. 9 the notched block 19, movable with the lever 15, abuts againsta sliding member 2i slot-ted to receive a pivoted block also movablewith said lever and the shaft- 17.

As horeinbofore indicated. when. in the operation of the device. theports 3 register with the ports 4 communication is open between thesteam space A and the steam admission sides of the pistons in thecylinders B. and when the ports 5 register with the ports-lcommunicationis open between the exhaust sides of the pistons in said cylinders B andthe exhaust space C.

lVhat we claim is:

1. The hereiinlescribed valve device, comprising. in combination, avalve chamber including a ported cylindrical outer member, inner membersof semi-annular form coaxial 5 outer member and said inner membersurging said inner members in radical direction, a spring between saidinner members urging said inner members apart in axial direction, and arotary central Valve comprising 10 a pair of balanced pistons fittedwithin said chamber.

2. The herein described valve device, comprising, in combination, avalve chamber including a cylindrical outer member, inner members ofsegmental form coaxial with and spaced radially from said outer member,the spaces between said outer member and the inner members being open toreceive steam, resilient means interposed between said outer member andsaid inner members urging said llTl'lGlT members in radial direction,resilient} means between said inner members urging said inner membersapart 1n axial direction, and a rotary central valve comprising a pairof balanced pistons, fitted within said chamber.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

JOHN WVIXL'LAOE. THOMAS ROBINSON LEES.

Witnesses HENRY MASON, FLORENCE HoUs'roN.

